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The Effect of Vertical Resolution on Zonal Wind Stress in AMIP Runs Glenn.White@noaa.gov
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An evaluation of monthly means from Suru Saha’s AMIP runs with observed SST 1979-2001 PRX 28 versus 64 levels Validation NCEP Reanalyses CDAS, NCEP2 FSU Stresses 1978-2000 SOC flux climatology 1980-93
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SOC 1980-83 Zonal mean Ocean
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5S-5N Pacific FSU 1980-93 SOC Time-mean U s
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Annual Cycle 1980-93 Pacific SOC FSU
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CDAS NCEP2
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28 levels 64 levels
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28 levels-NCEP2 64-NCEP2
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Time-mean zonal wind stress 1980-93 SOC Magnitude of systematic difference
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CDAS NCEP2
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28 levels 64 levels
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CDAS-SOC NCEP2-SOC
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28 levels minus SOC 64-SOC
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Systematic difference from FSU 1980-93 Mean Tropical Pacific
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JJA 1980-93 Time mean zonal wind stress FSU 28 64
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JJA 1980-93 Time mean zonal wind stress SOC CDAS NCEP2
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28-FSU 64-FSU 64-28 JJA 1980-93 Time mean zonal wind stress
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FSU-SOC FSU-NCEP2 CDAS-NCEP2 JJA 1980-93 Time mean zonal wind stress
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Anomaly correlation with FSU--Pacific CDAS NCEP2 28 levels 64 levels
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Merid. Wind Stress CDAS NCEP2 28 levels 64 levels Anomaly correlation with FSU merid. Wind stress 1979- 2000
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The reanalyses correlate better in time with FSU stresses than the AMIP runs, after the time-mean annual cycles are removed. Monthly anomalies 1979-2000 Pacific
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FSU Standard deviation of monthly anomalies 28 levels 64 levels 1979-2000
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Standard deviation of monthly anomalies 1979-2000 CDAS NCEP2
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28-FSU 64-FSU 64-28 Difference in standard deviation
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CDAS-FSU NCEP2-FSU CDAS-NCEP2 1979-2000
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64 levels do not produce better zonal wind stress than 28 levels. Reanalyses display more agreement with SOC, FSU than AMIP runs. 64 level AMIP run too strong easterly stress in JJA, too strong westerly stress in JFM.
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